键盘添加撤销操作

CustomKeyboard/View/KBKeyBoardMainView.m

@@ -115,6 +115,12 @@
     }
 }
 
+- (void)toolBarDidTapUndo:(KBToolBar *)toolBar {
+    if ([self.delegate respondsToSelector:@selector(keyBoardMainViewDidTapUndo:)]) {
+        [self.delegate keyBoardMainViewDidTapUndo:self];
+    }
+}
+
 #pragma mark - KBKeyboardViewDelegate
 
 - (void)keyboardView:(KBKeyboardView *)keyboard didTapKey:(KBKey *)key {